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Taiwan Semiconductor Corporation SMDJ33AH
- Part No.:
- SMDJ33AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ33AH.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,200
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Product details
Overview
SMDJ33AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 33V working stand-off voltage (VWM), 36.7–40.6V breakdown voltage (VBR), and 53.3V clamping voltage (VC) at 56.3A peak pulse current. It delivers AEC-Q101 qualification, ISO 7637-2 compliance, and sub-1ps response for automotive power line protection.
For engineers reviewing the SMDJ33AH datasheet, SMDJ33AH pinout, SMDJ33AH application, or SMDJ33AH equivalent, key selection criteria include clamping performance under 10/1000μs transients, thermal resistance (RθJA = 75°C/W), unidirectional polarity marking, and compatibility with automated SMT placement per J-STD-002 solderability standards.
Technical Context
The SMDJ33AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (36.7–40.6V @ 1mA). Its glass-passivated junction enables stable clamping at VC = 53.3V under 56.3A IPPM, sustaining 3000W peak pulse power per 1ms waveform per Fig.5.
Designed for automotive load-dump and ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity, it features TJ max = 175°C, RθJL = 15°C/W, and moisture sensitivity level 1 - enabling reflow compatibility without baking and robust operation across -55°C to +175°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 36.7 V / 40.6 V @ 1 mA - Confirmed avalanche initiation threshold for design margining |
| VC @ IPPM | 53.3 V @ 56.3 A - Clamped voltage during 10/1000μs transient, defining protected circuit stress limit |
| PPK | 3000 W - Peak pulse power handling per single 1ms event, derated above 25°C |
| TJ max | +175 °C - Maximum junction temperature enabling under-hood automotive deployment |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, critical for PCB copper area sizing |
| Response time | <1.0 ps - Sub-picosecond turn-on ensures protection before ESD or lightning-induced edges propagate |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, 0.290g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path in unidirectional clamp topology |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V battery rail); marked by band on package body |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Stable VBR tolerance and long-term leakage stability under humidity and thermal bias |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| J-STD-020 Level 1 | No floor life limitation or bake requirement prior to reflow - supports standard SMT assembly flow |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery line in engine control units exposed to load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and downstream DC-DC converter input. Use Value: Clamps transients to ≤53.3V, preventing overvoltage damage to 36V-rated input stages while surviving 3000W pulses. | Use Scenario: 24V digital input channel in programmable logic controller subject to field-wiring induced surges. IC Role / Device Role / Timing Role: Primary surge suppression device ahead of optocoupler or Schmitt-trigger input buffer. Use Value: Limits transient energy to safe levels within <1ps, preserving signal integrity and avoiding false triggering during EMC testing. |
| Telecom DC Power Feeds | Consumer Power Adapter Inputs |
Use Scenario: -48V DC feed lines in base station remote radio units encountering lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, protecting DC/DC front-end rectifiers and controllers. Use Value: Withstands repetitive 10/1000μs surges up to 56.3A while maintaining VWM = 33V for stable standby operation. | Use Scenario: Input stage of universal-input AC/DC adapter where bulk capacitor charging causes inrush-related voltage spikes. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after bridge rectifier, safeguarding primary-side controller ICs. Use Value: Fast response (<1ps) and low clamping ratio (VC/VBR ≈ 1.37) prevent latch-up or gate oxide rupture in MOSFET drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC33 | Same DO-214AB package, 33V VWM, but lower PPK = 1500W and higher VC = 58.1V @ 25.8A | Not suitable for ISO 7637-2 Pulse 1 (load dump); limited to lower-energy transients | Select SMDJ33AH when 3000W pulse handling and AEC-Q101 qualification are required. |
| 1.5KE33A | Through-hole DO-201 package, same VWM/VBR/VC specs, but RθJA = 10°C/W higher and no AEC-Q101 rating | Requires PCB through-hole layout; not qualified for automotive under-hood use | Choose SMDJ33AH for SMT automation, thermal performance, and automotive compliance. |
Compared with SAC33 and 1.5KE33A, the SMDJ33AH provides 2× peak power rating, certified automotive qualification, and superior thermal resistance - making it the preferred choice for space-constrained, high-reliability 12V/24V power rail protection where board area and qualification matter.
Availability
SMDJ33AH is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power feeds, and consumer power adapters requiring stable component supply across extended production lifecycles.
Supply support for SMDJ33AH includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SMDJ series is engineered specifically for high-power transient suppression in harsh environments - emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and surface-mount manufacturability in DO-214AB packages.
FAQ
What is the clamping voltage of the SMDJ33AH under maximum rated surge current?
The SMDJ33AH has a maximum clamping voltage (VC) of 53.3 V at 56.3 A peak pulse current (IPPM), measured under the standardized 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is confirmed in the Electrical Specifications table on page 2 of the official Taiwan Semiconductor datasheet revision B2104.
Is the SMDJ33AH suitable for bidirectional transient protection?
No, the SMDJ33AH is unidirectional only. For bidirectional operation, the designated variant is SMDJ33CAH, which uses a center-tapped dual-diode configuration. The SMDJ33AH features a cathode band marking and must be oriented with cathode toward the protected line - incorrect polarity will result in forward conduction and failure during normal operation.
Does the SMDJ33AH meet automotive qualification standards?
Yes, the SMDJ33AH is AEC-Q101 qualified and meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b. These qualifications are explicitly stated in the FEATURES section of the datasheet and verified through TSC's certified automotive test program - confirming suitability for under-hood and powertrain applications.
What is the thermal resistance from junction to ambient for the SMDJ33AH?
The SMDJ33AH has a typical junction-to-ambient thermal resistance (RθJA) of 75°C/W when mounted on a standard 1-inch² copper pad per JEDEC 51-3 guidelines. This value is critical for calculating maximum allowable power dissipation at elevated ambient temperatures and appears in the THERMAL PERFORMANCE table on page 2 of the datasheet.
Can the SMDJ33AH be used in automated SMT assembly processes?
Yes, the SMDJ33AH is optimized for automated placement with matte tin-plated leads compliant with J-STD-002, moisture sensitivity level 1 per J-STD-020 (no floor life restriction), and DO-214AB (SMC) package geometry compatible with standard pick-and-place nozzles. Its UL 94V-0 molding compound also supports lead-free reflow profiles without delamination.
SMDJ33AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 56.3A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ33AH FAQ
1.How can I place an order for SMDJ33AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ33AH on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMDJ33AH reliable?
The price and inventory of SMDJ33AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ33AH is usually 5 days.
3.What payment methods are accepted for SMDJ33AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ33AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ33AH?
SMDJ33AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ33AH order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMDJ33AH?
For technical support, including SMDJ33AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ33AH requirements.
6.How does Aetrix verify that SMDJ33AH is sourced from the original manufacturer or authorized distributors?
All SMDJ33AH products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMDJ33AH meets industry standards.
7.What is the process for return or replacement of SMDJ33AH?
All SMDJ33AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ33AH, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMDJ33AH part is unused and in its original packaging.
Return procedure for SMDJ33AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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